diff --git a/ui/src/data/types.ts b/ui/src/data/types.ts
new file mode 100644
index 00000000..85ce1287
--- /dev/null
+++ b/ui/src/data/types.ts
@@ -0,0 +1,58 @@
+export type BoundingBox = {
+  page: number;
+  left: number;
+  top: number;
+  width: number;
+  height: number;
+};
+
+export enum ENTITY_TYPE {
+  CITATION,
+  EQUATION,
+  SENTENCE,
+  SYMBOL,
+  TERM,
+}
+
+export type Entity = {
+  id: string;
+  type: ENTITY_TYPE;
+  attributes: {
+    boundingBoxes: Array<BoundingBox>;
+  };
+};
+
+export type Reference = {
+  id: string;
+};
+
+export type Symbol = Entity & {
+  type: ENTITY_TYPE.SYMBOL;
+  attributes: {
+    tex: string;
+    type: string;
+    mathml: string;
+    matchmlNearMatches: Array<string>;
+    isDefinition: boolean;
+    disambiguatedId: string;
+    nicknames: Array<string>;
+    diagramLabel: string | null;
+    definitions: Array<string>;
+    definingFormulas: Array<string>;
+    passages: Array<string>;
+    snippets: Array<string>;
+  };
+  relationships: {
+    equation: Reference;
+    children: Array<Reference>;
+    sentence: Reference;
+    parent: {
+      id: string | null;
+      type: string;
+    };
+    nicknameSentences: Array<Reference>;
+    definitionSentences: Array<Reference>;
+    definingFormulaEquations: Array<Reference>;
+    snippetSentences: Array<Reference>;
+  };
+};