What are the possible Field Types available in Custom fields?

The table below details the possible Field Types available in CRM Custom Fields:

Field type Maximum size Driven by Look up table Comments
multi-line 100 Yes Allows multiple values from a Look Up table to be selected. Stored and shown as multiple values separated by semi colons.
Checkbox n/a No Shows as a tick box
Date n/a Yes  
Email 50 Yes Will be hyperlinked for mailing when displayed
Number n/a Yes Will be totalled in Listing reports
Currency n/a Yes Shown with a currency symbol. Will be totalled in Listing reports
Memo Unlimited Yes Shown as a large box on forms
Percent n/a Yes Can be entered with a trailing %
Text 100 characters Yes  
Textarea 10.000 characters Yes Shown as a small box on forms
URL 100 Yes Will be hyperlinked for browsing when displayed