Invisible characters - ASCII

Question

Are there any invisible characters  I have checked Google for invisible characters and ended up with many answers but I m not sure about those  Can someone on Stack Overflow tell me more about this   Also I have checked a profile on Facebook and found that the user didn t have any name to his profile  How can this be possible  Is it some database issue  Hacking or something   When I searched over Internet  I found that 200D is an ASCII value with an invisible character  Is it true

User · Answer

I just went through the character map to get these  They are all in Calibri   Number        Name                       HTML Code      Appearance ------       --------------------    ---------       ---------- U 2000      En Quad                   amp  8192                8192   U 2001      Em Quad                    amp  8193               8193   U 2002      En Space                  amp  8194             8194   U 2003       Em Space                 amp  8195              8195   U 2004     Three-Per-Em Space      amp  8196             8196   U 2005     Four-Per-Em Space        amp  8197               8197   U 2006    Six-Per-Em Space         amp  8198             8198   U 2007    Figure Space             amp  8199               8199   U 2008    Punctuation Space       amp  8200                8200   U 2009    Thin Space               amp  8201               8201   U 200A    Hair Space               amp  8202              8202   U 200B    Zero-Width Space        amp  8203                8203   U 200C    Zero Width Non-Joiner   amp  8204            8204   U 200D    Zero Width Joiner       amp  8205                8205   U 200E    Left-To-Right Mark      amp  8206                8206   U 200F    Right-To-Left Mark      amp  8207                8207   U 202F    Narrow No-Break Space   amp  8239                8239

User · Answer

How a character is represented is up to the renderer  but the server may also strip out certain characters before sending the document   You can also have untitled YouTube videos like https   www youtube com watch v dmBvw8uPbrA by using the Unicode character ZERO WIDTH NON-JOINER  U 200C   or  amp zwnj  in HTML  The code block below should contain that character

User · Answer

There is actually a truly invisible character  U FEFF  This character is called the Byte Order Mark and is related to the Unicode 8 system  It is a really confusing concept that can be explained HERE The Byte Order Mark or BOM for short is an invisible character that doesn t take up any space  You can copy the character bellow between the  gt  and  lt   Here is the character    gt    lt   How to catch this character in action   Copy the character between the  gt  and  lt   Write a line of text  then randomly put your caret in the line of text Paste the character in the line  Go to the beginning of the line and press and hold the right arrow key   You will notice that when your caret gets to the place you pasted the character  it will briefly stop for around half a second  This is becuase the caret is passing over the invisible character  Even though you can t see it doesn t mean it isn t there  The caret still sees that there is a character in that area that you pasted the BOM and will pass through it  Since the BOM is invisble  the caret will look like it has paused for a brief moment  You can past the BOM multiple times in an area and redo the steps above to really show the affect  Good luck  EDIT  Sadly  Stackoverflow doesn t like the character  Here is an example from w3 org  https   www w3 org International questions examples phpbomtest php

User · Answer

Other answers are correct -- whether a character is invisible or not depends on what font you use  This seems to be a pretty good list to me of characters that are truly invisible  not even space   It contains some chars that the other lists are missing                u2060      Word Joiner               u2061      FUNCTION APPLICATION               u2062      INVISIBLE TIMES               u2063      INVISIBLE SEPARATOR               u2064      INVISIBLE PLUS               u2066      LEFT - TO - RIGHT ISOLATE               u2067      RIGHT - TO - LEFT ISOLATE               u2068      FIRST STRONG ISOLATE               u2069      POP DIRECTIONAL ISOLATE               u206A      INHIBIT SYMMETRIC SWAPPING               u206B      ACTIVATE SYMMETRIC SWAPPING               u206C      INHIBIT ARABIC FORM SHAPING               u206D      ACTIVATE ARABIC FORM SHAPING               u206E      NATIONAL DIGIT SHAPES               u206F      NOMINAL DIGIT SHAPES               u200B      Zero-Width Space               u200C      Zero Width Non-Joiner               u200D      Zero Width Joiner               u200E      Left-To-Right Mark               u200F      Right-To-Left Mark               u061C      Arabic Letter Mark               uFEFF      Byte Order Mark               u180E      Mongolian Vowel Separator               u00AD      soft-hyphen

User · Answer

An invisible Character is      or U 200b

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