Flesh marketers in Japan long ago came up with buzzwords regarding the bra size of aidoru, porn stars, and gurabia aidoru (bikini girls like on the cover of weekly manga magazines). These buzzwords are surely a catchy and easier way to remember than a letter for cup size. In a surprisingly short time these words have become a part of common everyday Japanese.

The terminology includes:
kanji - hiragana - romaji
word and chinese characters description/explanation

美乳 - びにゅう - bi nyuu
"beautiful breasts." Both A and B cups. (bi) is the kanji for beautiful. (nyuu) is a kanji for breasts.

However, in the Japanese vernacular, binyuu are jokingly known as

貧乳 - ひんにゅう - hin nyuu
"poor breasts (in size)." (hin) is the kanji for lacking or flat broke.

巨乳 - きょにゅう - kyo nyuu
"giant breasts." Both C and D cups. (kyo) is the kanji for big or giant.

A few years ago, with the growing demand for quantitty over quality, a new group has emerged.

爆乳 - ばくにゅう - baku nyuu
E cup and above. (baku) is the kanji for bursting or exploding. Kinda interesting meaning when talking about the old "bombs".

This wu has Japanese fonts.