Did individual divisions of the Roman army have insignia or mottos?

General Questions
#1

The cool patches (all the more necessary, I would think, for illiterate soldiers). Since they already knew Latin, mottos could be readily chosen. (That sentence was jokey, but I’m serious about the motto question.

I say “divisions” not in any military specific way. I just don’t know the structure similar to divisions, battalions, units, etc.

#2

You’ve surely heard the term “Roman legions”?

The Wikipedia page on Roman legions lists their emblems by name, and has an example or two. No doubt googling a phrase such as “roman legion insignias” will help you further.

#3

Look up the Notitia Dignitatum, a 4th-century book which is crammed full of them.

#4

Thanks. Interesting.

#5

Wow, the Roman Army had a group that used the Yin Yang 700 years before it’s use in Taoism and apparently they also have radioactive soldiers! (bottom row this page):
http://en.wikipedia.org/wiki/File:Notitia_Dignitatum_-_Magister_Peditum_4.jpg