Two well known logos are the Microsoft Windows colorful skewed blocks, and Apple’s apple with a bite missing. Every popular browser has a recognizable logo. Logos do change – usually incrementally.
Some logos are of the form known as wordmarks. A great example of that is the Coca Cola wordmark – in red, with flowing script, it is known the world around. Another, as well known although not as old, is the Google wordmark displayed on the Google homepage.
When a word is trademarked, it must not be in general use as a category. This is the reason why Google, despite Larry Page himself using the word googled, attempts to keep googling from becoming a synonym for searching on the Internet. Language, however, changes. The verb google, or googled, entered dictionaries in 2006, and was named the word of the decade of 2000 – 2009.
image Firefox logo by Andreia on Flickr