Here is a 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
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 Means an instant message was sent to the client  
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 Means that a work order has been created in Lightspeed  
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Means a request from the client was added to this appointment or that a note was added to the appointment
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 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