The lock icon (
)on your appointments gives you a quick way to know if a clinical note has been locked without having to open the appointment to check. Once a note is locked, the icon will appear when viewing the schedule. For example, below we can see that notes for 3 of the appointments have been locked.
The flag icon (
) lets you know that you have assigned a flag to this patient. For more information on assigning flags to patients, see our article here. 
You can control whether or not the icons appear by going to Account > Account Settings.
Under the General tab, you check or uncheck the boxes to have the lock and/or flag icons appear.
Scroll down and click Update Entire Profile to save your settings.
