Final answer:
The pencil icon signifies that field data is editable across multiple platforms, whereas other icons have different functionalities related to field properties.
Step-by-step explanation:
The icon that typically denotes that the field data is editable is a pencil. This icon is used as a universal edit symbol across various platforms, indicating that you can click to make changes to the content of the field. Other icons, such as a magic wand, asterisk, or padlock, have different meanings.
The magic wand usually relates to automatic or guided actions, an asterisk often indicates that a field is required, and a padlock implies that the field is locked or secure and cannot be edited.
The icon that denotes that a field data is editable is the Pencil icon. It is a common symbol used in user interfaces to represent the ability to edit or modify data. The pencil icon is often used in various applications and web forms.
Therefore, the correct answer is pencil.