diff --git a/lang/ast/atom.c b/lang/ast/atom.c
new file mode 100644
index 0000000..a4f9d6d
--- /dev/null
+++ b/lang/ast/atom.c
@@ -0,0 +1,18 @@
+#include "ctx.h"
+#include "node.h"
+
+#include <stdio.h>
+
+static void print(struct ivy_ast_node *node)
+{
+	struct ivy_ast_atom_node *v = (struct ivy_ast_atom_node *)node;
+
+	printf("%s (%s)\n", ivy_ast_node_type_to_string(node->n_type),
+	       v->n_content->t_str);
+}
+
+struct ast_node_type atom_node_ops = {
+	.n_print = print,
+	.n_state_size = sizeof(struct parser_state),
+	.n_node_size = sizeof(struct ivy_ast_atom_node),
+};
diff --git a/lang/ast/expr/arith.c b/lang/ast/expr/arith.c
index 91fe4a8..ecc0c28 100644
--- a/lang/ast/expr/arith.c
+++ b/lang/ast/expr/arith.c
@@ -79,6 +79,14 @@ enum ivy_status arith_push_operand(
 		b_queue_push_back(&state->s_output_queue, &v->n_base.n_entry);
 		break;
 	}
+	case IVY_TOK_ATOM: {
+		struct ivy_ast_atom_node *v
+			= (struct ivy_ast_atom_node *)ast_node_create(
+				IVY_AST_ATOM);
+		v->n_content = tok;
+		b_queue_push_back(&state->s_output_queue, &v->n_base.n_entry);
+		break;
+	}
 	case IVY_TOK_STRING: {
 		struct ivy_ast_string_node *v
 			= (struct ivy_ast_string_node *)ast_node_create(
diff --git a/lang/ast/expr/expr.c b/lang/ast/expr/expr.c
index bce7c6d..78a7698 100644
--- a/lang/ast/expr/expr.c
+++ b/lang/ast/expr/expr.c
@@ -24,6 +24,7 @@ struct ast_node_type expr_node_ops = {
 		TOK_PARSER(IDENT, arith_parse_ident),
 		TOK_PARSER(INT, arith_parse_operand),
 		TOK_PARSER(DOUBLE, arith_parse_operand),
+		TOK_PARSER(ATOM, arith_parse_operand),
 		TOK_PARSER(STRING, arith_parse_operand),
 		TOK_PARSER(SYMBOL, arith_parse_operator),
 		TOK_PARSER(LABEL, arith_parse_label),
diff --git a/lang/ast/node.c b/lang/ast/node.c
index 2584156..483539a 100644
--- a/lang/ast/node.c
+++ b/lang/ast/node.c
@@ -18,6 +18,7 @@ extern struct ast_node_type op_node_ops;
 extern struct ast_node_type ident_node_ops;
 extern struct ast_node_type int_node_ops;
 extern struct ast_node_type double_node_ops;
+extern struct ast_node_type atom_node_ops;
 extern struct ast_node_type string_node_ops;
 extern struct ast_node_type cascade_node_ops;
 extern struct ast_node_type cond_group_node_ops;
@@ -42,6 +43,7 @@ static const struct ast_node_type *node_ops[] = {
 	[IVY_AST_IDENT] = &ident_node_ops,
 	[IVY_AST_INT] = &int_node_ops,
 	[IVY_AST_DOUBLE] = &double_node_ops,
+	[IVY_AST_ATOM] = &atom_node_ops,
 	[IVY_AST_STRING] = &string_node_ops,
 	[IVY_AST_CASCADE] = &cascade_node_ops,
 	[IVY_AST_COND_GROUP] = &cond_group_node_ops,