ISO

ISO stands for "In search of," and is typically seen on social media and in classified and want ads. It is used to communicate that you are looking for something or someone.

While ISO was more often seen in ads in newspapers before the 2000s, the acronym is now more commonly seen on social sites, like Facebook or Twitter. People typically start their post with "ISO," and then follow it with a description of something they need.

One common thing often searched for is a reference for a service like furnace repair or landscaping. People also commonly look for used items others are looking to get rid of, usually for free, like hand-me-down kids shoes or furniture.

An acronym for an employee stock option; requires the holder to hold onto the stock for a longer period of time for better tax treatment, which makes it more risky; taxed at the capital gains rate instead of the ordinary income tax rate; may also stand for "incentive share options."

In personals ads, ISO typically stands for "is seeking other." Which makes sense, given most personals are posted by people hoping to find a new romantic partner. (Alternatively, some personals are posted by people seeking a new friend who is into the same niche hobby.)

Usually, ISO appears before a description of the kind of person the advertiser is seeking. For example, a personals ad might end with "ISO who is 6' 2" or taller, has job, and is outdoorsy." If you fit the given description, maybe you should reply to the ad ...

Iso is short for "isotonitazine," a dangerous synthetic opioid much more potent than morphine and fentanyl. It is one of many drug abbreviations, along with xan, addy, and cid.

The drug gained popularity on the streets near the end of 2022 and the beginning of 2023. It may appear in various forms, including tablets, powders, and solutions.

You will likely only see the abbreviation online or in texts in convos about the drug. For example, "Be careful about iso, it's way too potent and potentially lethal."