With prefix and suffix
To help users understand how the input should look like. Often used for units of measurement.
How it looks (preview)
How to call this example
<%= render "govuk_publishing_components/components/input", {
label: {
text: "Cost per item, in pounds"
},
name: "cost-per-item",
width: 10,
prefix: "£",
suffix: "per item"
} %>