Chuánshuō yázì shì lóng de dì'èr ge érzi, suǒyǐ gǔrén cháng bǎ tā kè zài dāobǐng shàng.
Legend says Yazi is the dragon's second son, so people of old often carved it on sword hilts.
Tips
usage
睚 is the corner of the eye and 眦 its rim: opening them wide is a glare. The word lives in 睚眦必报 "to repay every angry look", said of a petty, vindictive person.