C02 Surface engraving is the most common way of  engraving because of it’s versatility
Engraving on most materials i.e. wood, layered plastic’s, coated metal, stone, slate
Pictures logos and different texes can be arranged engraved then cut into any shape
Some of the Common uses are:

LAYERD PLASTICS
Name Badge, Awards & Promotional Items i.e. Pens Keyrings, Memorial & Grave Side Decorations ,Electrical Panel Facias Etc

Wood       

House Name Plates , Awards Trophies, Sports Club Brading and the list is Endless