The icons next to the class schedules indicate the following:
‘W’: This icon means the class is on a waitlist. All spots have been booked out, but you can join the waitlist and will be notified at least 12 hours before the class if a spot becomes available.
‘S’: This icon signifies that a substitute instructor is teaching the class. This means the regular instructor for that time slot is not available, but a substitute will be covering the session.