How to put a symbol above (on the head of) another? For example, I want to produce something like this in one line.

```
a
#
```

i.e., `a`

above `#`

.

The effect should be almost the same with `$#^a$`

except that `a`

is on the top instead of top right of `#`

.

This question is related to
`latex`

Use `\overset{above}{main}`

in math mode. In your case, `\overset{a}{\#}`

.

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