ICO
Initial coin offering
Example

One of many ICOs advertised on Twitter
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Last Updated: May 12, 2021
In care of
Specifies the person who a message or letter is for, i.e., a letter may have the phrase "ICO John," which means it is intended for John.
Example
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Last Updated: December 23, 2013
In concern of
When you are discussing a matter that concerns a specific person, ICO stands for "in concern of." It is used to identify the person the matter concerns.
For example, in an email thread in which a group of managers is discussing new employees, one of them may begin a sentence with "ICO Sarah ..." before relating Sarah's job performance and future prospects.
However, ICO more commonly means "in care of," a phrase that is used to denote the person a letter or other message was intended for. Hopefully, context will tell you whether ICO is meant to mean "in concern of" or "in care of."
Example
ICO of The Dude ...
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Last Updated: June 17, 2021
When discussing cryptocurrency, ICO stands for "initial coin offering." It is the moment or event in which a crypto company begins selling its cryptocurrency.
An ICO is much like an IPO, except for a cryptocurrency instead of a stock. However, those who purchase coins during an ICO are not purchasing ownership in a crypto company. Instead, they are purchasing the company's currency - which they hope will increase in value.
Because ICOs and cryptocurrencies are unregulated, nearly anyone can offer an ICO. As a result, a number of purported ICOs are actually scams meant to bilk people of their money. Before taking part in any ICO make sure to do your DD and determine that the company offering the ICO is both real and reputable.