praise, title on a picture
讃 centers on expressing approval or admiration: praising someone or something, and by extension, an inscription of praise such as a title on a picture.
讃 is the modern simplified form of 讚. The older form combines 言 (speech) with 贊, which likely contributed both sound and the idea of assisting or praising. The modern right side 賛 is a simplified version of 贊.
The left side 言 (speech) and the right side 賛 (which itself suggests approval or help) combine to show words of praise. Picture someone speaking words of praise while presenting a picture with a title.
For サン, imagine praising the sun: sun -> サン, and your words of praise rise like the sun.
Sanuki (former province located in present-day Kagawa Prefecture)
hymns of praise in Japanese
Dosan Main Line (Kochi-Kagawa Railway)
Japanese hymn praising the coming of the Buddha (thought to be written by Minamoto No Makoto)
legend over a picture; inscription (legend, writing) on a painting
dance recital praising Buddha, which accompanies the recital of a gatha (in the Pure Land Sect of Buddhism)
Sanuki udon; thick udon from Kagawa prefecture
sanukite
Kagawa dialect
Sanuki accent, used in northern Shikoku
praising Buddha; sermon
praise
Chinese "ghost" constellation (one of the 28 mansions)