The old Arabic (and other Semitic) word 'lah' means god. Similar to the Akkadian 'el' or 'elu', from where the name Babel (bab-elu = gateway to god) comes from.
al-Lah adds the definite article, meaning the one god.
This is a linguistic description - it says nothing about how the term has been used or interpreted over the ages.
Edit:
If you're referring to the common Islamic symbols of Crescent Moon and Star, this comes from the Ottoman Empire, who themselves took it from the Byzantine symbol of Constantinople when they captured the city in 1453 AD.
The symbol was in use while the city was called Byzantion. By tradition, it was founded in 667 BC as a Megaran colony, before later name changes to Byzantium, Constantinople and Istanbul.
The crescent represented the Greek god Artemis and was also associated with Hecate by some cults, and the star was added to represent the virgin Mary when Emperor Constantine I changed the official state religion to Christianity.
So, you could describe the symbol as representing Artemis, and has long been used by Greek pantheists and Christians before Muslims. It is still used by the Orthodox church in Jerusalem.
How you choose to interpret any symbol now is up to you.