BYOS stands for Bring Your Own Device and is a term commonly used in the technology industry. However, there are several other synonyms that can be used to express the same idea. One popular term is 'CYOD' (Choose Your Own Device) which means that employees are given a list of approved devices to choose from. 'COPE' (Corporate Owned, Personally Enabled) is another term used to describe a policy where employees bring their own devices, but the company owns and manages them. Other synonyms for BYOS include 'BYOT' (Bring Your Own Technology), BYOD (Bring Your Own Device), and 'BYOP' (Bring your Own Phone). These terms all refer to the same concept of employees bringing their own personal devices to use at work.