In situations where tempered or laminated glass are called for by code, manufacturers are required to label those lites (panes) of glass with a “bug” or logo. These bugs are printed in a light white hue and found along the perimeter, usually at a corner.
In instances where safety glass is not required, you may request that the bug be left off the glass. For example, tempered glass is often used in cabinet shelves for its strength, but the bug would not be desired, as the etching can distract from items on display. In such instances, the only way to tell whether your glass is tempered or annealed is to break it!
You can tell if you have laminated glass by viewing it on edge. Laminated glass has a visible interlayer. It also sounds different from annealed or tempered glass when knocked on (but it may require an ear attuned to the difference).