I haven’t heard those names in a long time…

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\mathbf. It’s consistent with \mathrm for well-defined constants

If you like mathbf more then at least redefine vec and use vec. Keeps the code more tidy.

Mathbf, cause we’re best friends.

Arrows are more descriptive. \vec is better.

\mathbf{} cause I can just use Ctrl+B on overleaf.

All in with the crabs.

Neither, I just write a symbol.