B5kokoisen
B5kokoisen is a term that appears to be a phonetic spelling or a transliteration from a Slavic language, likely Polish, referring to something that is "B5 sized." The B5 paper size is an international standard defined by ISO 216, measuring 176 x 249 millimeters (6.9 x 9.8 inches). This dimension makes it smaller than A4 but larger than A5.
In practical terms, B5kokoisen would likely refer to items or documents that conform to this specific paper
The use of such a term might be found in specific regional contexts, product descriptions, or informal