To unhide all objects in Blender, press Alt+H. This will reveal any objects you may have accidentally hidden.
Here's a bit more context and related information:
Understanding Hiding in Blender
Accidentally hiding objects is a common occurrence, particularly because the "H" key is close to the "G" (grab/move) key. When you press H, the selected object(s) disappear from the viewport, but they are not deleted. They are merely hidden from view.
Unhiding Options
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Unhide All (Alt+H): This is the quickest and easiest way to unhide everything. It reveals all hidden objects in the current scene, regardless of how they were hidden.
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Unhide Selected (Shift+Alt+H): This option only unhides the objects that are currently selected in the Outliner. This is useful if you only want to reveal specific objects.
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Reveal Hidden Objects through the Outliner: You can also unhide objects individually by finding them in Blender's Outliner (usually located on the top-right side of the default Blender layout). Hidden objects will have a greyed-out icon (usually an eye). Click the eye icon to toggle the object's visibility.
Avoiding Accidental Hiding
While accidental hiding can happen, being mindful of your key presses and using the Outliner for object selection can help minimize these occurrences.
Summary
The easiest way to unhide all objects in your Blender scene is to press Alt+H. This will reveal all objects that have been hidden.
