Help me explain mean of AIX Version ?

Anyone can help me explain the mean of AIX 5L 5.3 ML3

I don't know "what re - 5L mean and ML3 mean "

Tks all.

AIX 5 Means its from the 5th series (either 5.1, 5.2, or 5.3). The L is to show IBM's strong affinity with Linux. ML3 means its Maintenance Level 3. Think of ML as windows' Service Pack

Okie, tks you for your helping.

Cheers.