Here is a short guide to help you understand the meaning of the icons displayed in appointments:
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Means it’s a new customer OR that it is marked by staff (appointments can be manually marked in the 'Calendar' tab)
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 Means the client has arrived

 Means an instant message was sent to the client  

 Means that a work order has been created in Lightspeed  

Means a request from the client was added to this appointment or that a note was added to the appointment

 Means a sale was created in Lightspeed
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 Mean a payment with Stripe has been made, OR a payment with Square has been made, OR an invoice was created