How to explain the missing words in calligraphy works in inscriptions

You can indicate where the word XXX is missing at the signature, and then indicate the source, time and name. It is normal to miss it.

Ancient letters, calligraphy and paintings all have inscriptions. When giving gifts, the name and date are written vertically with a brush to show the giver and the recipient. This is also a manifestation of calligraphy art. Now many people sign official documents and notes, usually horizontally, to show their legal effect.