Chestnut

An edible sweet chestnut, the kind you roast and peel.

The drawing is a single chestnut: a rounded brown nut with a pale, rough base and a small point on top, sometimes with a leaf. That is the sweet chestnut, the fruit of the chestnut tree, which has been a staple food across southern Europe, Turkey, China, Korea and Japan for thousands of years. Roasted over coals and sold in paper cones, it is the classic street snack of cold weather, from Istanbul's kestane carts to Italian caldarroste, French marrons chauds and the sugar-roasted chestnuts of northern China. It is also cooked into stuffing, soups, purées, candied marrons glacés and desserts like the mont blanc.

The emoji comes from the Japanese phone sets that predate Unicode's emoji, where the chestnut (kuri) belongs to the same autumn-food family as the roasted sweet potato 🍠. In Japan chestnut rice and chestnut sweets are September-to-November fixtures, so the nut is as much a season as a food.

What does it mean when someone sends 🌰?

Usually food or the feeling of autumn; rarely a joke about anatomy.

In a recipe, a market photo or a message about a walk through fallen leaves, take it literally: chestnuts, nuts, or a warm, crunchy, sweater-weather mood. Around Christmas it nods to the song line about chestnuts roasting on an open fire. Many people also use it for any nut the keyboard lacks, including the acorn and the horse chestnut (conker) children collect in parks.

Because English calls testicles "nuts", the chestnut can carry that meaning in a bawdy or body-focused thread, and it appears in jokes and men's-health posts that way. Nothing about the picture itself is rude: unless the words around it are, read it as food.