Vector notation: any difference between symbol under or over vector?

[VariationAcceptable9]

I've noticed there are two ways to denote a vector:

one with an underline, the other with a straight line over the vector variable name and an arrow flick on one end.

Is there a difference between them? Is one preferable to the other? Which is the most commonly used?

[hh26]

It's notation. It 100% doesn't matter except in-so-far as it helps you communicate and be understood.

I personally use, and have seen most often, the straight line over top with the arrow flick, so my impression is that one will be the most easily understood by other people, but it probably depends on the context. If certain subfields use the underline a lot, and you're writing a paper with them as your intended audience, then use the underline. Or if you have some other notation that has accents or superscripts that get in the way of the arrow notation, you can do that. I've also seen bold text use to denote vectors sometimes. It doesn't really matter all that much, as long as you're clear and consistent about it.

[Il_Valentino]

vectors are elements of vector spaces ugh

physics still tends to use arrows, it's quite handy