Handy Helpful Hint: validating your bus-tram-light rail tickets

I see lots of people, Italians included, suffering through their first exposure to these tickets with the magnetic strip, so I thought I'd give you a helping hand, especially for those not used to taking public transportation.

On the bus, tram and light rail ("passante") tickets used in Milan there is a stylized arrow pointing in the direction in which the ticket needs to be inserted into the machine, whether the direction is perpendicular to the ground, and away from you, as is the case with the subway, or--as in this case--straight downwards in front of you (light rail uses both kinds).

Where's the arrow? Look to the left hand side of the ticket in my hand; it's also pointing in the direction of the much more visible ATM logo.

Enjoy!