Traders are better off NOT using documents like LOI, ICPO, FCO, etc. Even if and when they rarely are used in internal trades, on a restricted level within specific industries, they have no legal or customary basis in International Trade whatsoever. In fact the presence of many of these terms are considered to be signs of Advance Fee Fraud, by knowledgeable players and law enforcement.
If you are a landlord or a property owner and have been approached by a cellular carrier or cell tower developer about putting a cell site on your property, here is the rule for dealing with tower companies or carriers who try and get you to sign a "Letter of Intent"....... DON'T SIGN ANYTHING!!!!!!! Call your counsel or better yet call a qualified wireless consultant that can guide you and fight for your rights and needs. The carriers have experts...why shouldn't you?