I can't enter some characters (pipe, backslash, etc.) in the terminal

If characters like | or \ do not work in the terminal, the Option key is usually mapped as Meta. When this setting is enabled, some special characters may not be sent as expected.

Disable Use Option as Meta key for your platform:

macOS

1. Open Termius → Settings.
2. In the Terminal section, disable Use Option as Meta key.

iOS/iPadOS

1. Open the system Settings.
2. In the Keyboard section, turn off Use Option as Meta key.

After you disable this setting, try entering the character again in the terminal.