On official documents in Japan, a name-stamp is used rather than a signature. Seals vary in size and shape, but generally the bigger the seal, the greater the status. The seal for a university, for example, will be larger and more impressive-looking than the seal for an individual. Metaphorically, a “drum-size seal” is an enthusiastic endorsement, often used as a strong recommendation.
A: Aa, Kawakami ga otaku no kaisha ni nyuusha shita n desu ka. Kare wa yuushuu deshite ne. Hitogara wa watashi ga taikoban o oshimasu yo.
A: Oh, Kawakami is now at your company? He’s brilliant, isn’t he? And I can highly recommend his personality, too.