Justin
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That is read as 'tomo' or 'yuu' (友) and is the first character in the word 'tomodachi' (友達) and 'yuujin' (友人).
友 means 'friend' or companion.
Both 友達 and 友人 also mean 'friend', I've been told by a native 友人 is slightly more formal.
友達 is the word you have there (友だち).