Han character 
- KangXi: page 106, character 21
- Dai Kanwa Jiten: character 736
- Dae Jaweon: page 227, character 4
- Hanyu Da Zidian: volume 1, page 173, character 2
- Unihan data for U+4FFA
俺 (Yale yim3)
Alternative forms 
Originally a second person pronoun. Gradually changed into a first person pronoun.
Usage notes 
俺／おれ is the usual casual form used by men, and is completely acceptable with friends; 僕 or 私 are too formal for casual use. Conversely, in polite conversation or where polite forms are expected, 俺 is unacceptable and rude. As with other casual forms, may be used intentionally if one wishes to be rude, but should not be used otherwise.
See also