Can't execute query

SELECT p.*,c.id as cid FROM products_eng as p, categories_eng c, products_category_eng as it WHERE (p.id = '21286353' || p.serial_no = '21286353') AND p.id = it.pid AND it.category=c.id AND (p.available='1' OR (p.available='2' and p.sdate <= '2021-12-01' AND p.edate >= '2021-12-01')) AND c.available = '1' AND it.category in (���������������������) GROUP by it.pid

MySQL Error: Unknown column '���������������������' in 'where clause'

This script cannot continue, terminating.