I believe the shirts you are referring to are "Southern Tide" brand with the little fish on them. I just recently picked up a Southern Tide polo and can now say it truly is the best polo out there.
The Nike brand uses a logo called 'Swoosh' which looks like a tick.
modern amusement :)
Dell
Gloomy Bear
Facebook uses the blue thumbs up logo as their brand image. In India, Thums Up Cola uses the red thumbs up image as a brand logo.
OpenBSD
White westinghouse
History Channel
Gloomy Bear
wrangler
The Batman series is a brand that has a bat as its logo. The rap group, The Wu-Tang Clan also uses the bat as its logo.
The Hallmark Channel uses a gold crown for its logo. It is the same logo Hallmark has been using for years on their greeting cards and gifts.