a simple template to be used in various to-do lists for easier organization of solved and unsolved issues.

Check marks Cross marks
{{Check mark}} Green tickY {{X mark big}} Red XN
{{Tick}} = {{tick|20}} checkY {{Cross}} = {{cross|20}} ☒N
{{Aye}} Green tickY {{Nay}} Red XN
{{Ya}} Yes {{Na}} No
{{Check mark-n}} YesY {{X mark-n}} NoN
{{Y&}} {{N&}}
{{Checked box}} checked box {{Xed box}} X'ed box
Other marks
{{N.b.}} Nota bene* {{Hmmm}} ????
{{Bang}} exclamation mark 
Most of the templates above are fully sortable in a class="sortable" table (each check mark is assigned an undisplayed "Y" and each cross mark an undisplayed "N").