The term LA's Lead-In is a combination of two words, the first being 'SOL' and the second being 'tra'. SOL is an abbreviation for the Latin word 'solum', which means 'ONLY' or 'ALONE'. Tra is an abbreviation for the Latin word 'transire', which means 'to pass over'. Together, these two words form the phrase 'solum transire', which translates to 'ONLY pass over' or 'ONLY lead in'. This phrase is often used to describe the entrance of Los Angeles, California, into the United States.