066 Subfield $c - Alternate G0 or G1 character set:

Subfield $c contains a code identifying an alternative character set used as either G0 or G1 sets in the record. The code is the Intermediate and Final characters of each escape sequence that will be used to designate an alternate graphic character set used in the record. The intermediate character(s) indicate whether the set is single or multibyte and whether it will be designated as a G0 or G1 set. The subfield is repeated for each additional character set present.

Example:

066 ##$c)2

[The Intermediate character in the designation sequence is hex 29 (ASCII graphic ")") that identifies the character set as the G1 set and one byte per character, and the Final character is hex 32 (ASCII graphic "2") that identifies the Hebrew character set.]