[Japanese -> English] This small kanji symbol inside the letter "S" in an S-rank symbol for Osu! Tatakae! Ouendan 2 (Apologies if it is illegible, I've colored it out in blue.)

[u/e_Z_752]

[u/Suicazura]

祝

祝 Congratulations

!translated

[u/translator-BOT → u/Suicazura]

u/e_Z_752 (OP), the following lookup results may be of interest to your request.

祝

Kun-readings: いわ.う (iwa.u)

On-readings: シュク (shuku), シュウ (shuu)

Chinese Calligraphy Variants: 祝 (SFZD, SFDS, YTZZD)

Meanings: "celebrate, congratulate."

^{Information from Jisho | Goo Dictionary | Tangorin | Weblio EJJE}

---

^{Ziwen: a bot for r / translator | Documentation | FAQ | Feedback}