When "LOI" is used, it actually refers to the Letter of Indemnity. This is standard usage of the term and has been for decades. The Letter of Intent (hereafter referred to as LOI) is often used in specific domestic trades, such as in real estate or corporate mergers, but it has no standard usage in International Trade itself.
Other Terms and Conditions: This letter of intent sets out the conditions of the proposed sale and is dependent upon the signing of a definitive agreement by and concerning the buyer, seller and the company. The definitive agreement shall hold the schedules, representations, covenants, indemnities and all other provisions according to the terms and conditions of the letter of intent and following all standard conventions in regard to all usual and applicable commercial practices.