Means, marks

At almost every T-junction in the city, there will be some form of Vinayagar looking out towards the road / path which forms the stem of the T. Someone once told me that it is because having this kind of junction invites trouble / evil eye / whatever coming straight down to the junction of the T and having a powerful deity there will frustrate the evilness barrelling down in a straight line. And who better than Vinayagar, the destroyer of obstacles?

This one is near the Bala Vidya Mandir in Adayar. Most of the 'muchandi Vinayagar's, as the icons at such junctions are called are just an alcove on the wall. This is obviously much more well developed. As I was passing by this morning, I noticed a young lad in his school uniform praying very deeply; apart from being Vinayagar, this is also Ganapathi, the divine amanuensis, so it is good for schoolkids to have Him on their side when they're facing exams. 

But because it was a schoolboy, I mis-read the name of this deity. The red board says it is "Marga Sahaya Vinayagar" or the one who helps you on your path, the means to your end. I was quick to read it as being the students' friend: "Mark-a Sahaya Vinayagar" - the one who helps you get marks!