The digits can be read asyon-roku-shi-ku, which is similar toよろしく(yoroshiku,“pleased to meet you; regards”).
4649• (yoroshiku)
- pleased to meet you; let's get along well
- 2005, 七瀬晶 Nanase Hikaru,Project SEVEN, p12
- 『今回も4649! 数学はないの?』
- “Konkai moyoroshiku ! Sūgaku wa nai no?”
- Nice to meet you! There is no math?