The term 'INK HOLDERS IN PENS AND SQUID' can be summarized as SACS, which stands for 'Squid Assembled Cartridge System'. This is a type of ink holder used in pens and squid, which are both writing instruments. The Squid Assembled Cartridge System is a type of ink holder that is designed to hold ink securely and provide a consistent flow of ink when writing. It is also designed to be easy to replace and refill.